9.8
CRITICAL
CVE-2021-25309
Gigaset DX600A Telnet Authentication Bypass
Description

The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.

INFO

Published Date :

March 2, 2021, 1:15 a.m.

Last Modified :

Nov. 21, 2024, 5:54 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-25309 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Gigaset dx600a_firmware
2 Gigaset dx600a
: Total Affected Vendor : 1 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-25309.

URL Resource
https://research.nccgroup.com/2021/02/28/technical-advisory-administrative-passcode-recovery-and-authenticated-remote-buffer-overflow-vulnerabilities-in-gigaset-dx600a-handset-cve-2021-25309-cve-2021-25306/ Third Party Advisory
https://research.nccgroup.com/2021/02/28/technical-advisory-administrative-passcode-recovery-and-authenticated-remote-buffer-overflow-vulnerabilities-in-gigaset-dx600a-handset-cve-2021-25309-cve-2021-25306/ Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-25309 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-25309 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://research.nccgroup.com/2021/02/28/technical-advisory-administrative-passcode-recovery-and-authenticated-remote-buffer-overflow-vulnerabilities-in-gigaset-dx600a-handset-cve-2021-25309-cve-2021-25306/
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Apr. 26, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-269
    Added CWE NIST CWE-521
    Added CWE NIST CWE-307
  • Initial Analysis by [email protected]

    Mar. 09, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://research.nccgroup.com/2021/02/28/technical-advisory-administrative-passcode-recovery-and-authenticated-remote-buffer-overflow-vulnerabilities-in-gigaset-dx600a-handset-cve-2021-25309-cve-2021-25306/ No Types Assigned https://research.nccgroup.com/2021/02/28/technical-advisory-administrative-passcode-recovery-and-authenticated-remote-buffer-overflow-vulnerabilities-in-gigaset-dx600a-handset-cve-2021-25309-cve-2021-25306/ Third Party Advisory
    Added CWE NIST CWE-269
    Added CPE Configuration AND OR *cpe:2.3:o:gigaset:dx600a_firmware:v41.00-175:*:*:*:*:*:*:* OR cpe:2.3:h:gigaset:dx600a:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-25309 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-25309 weaknesses.

CAPEC-16: Dictionary-based Password Attack Dictionary-based Password Attack CAPEC-49: Password Brute Forcing Password Brute Forcing CAPEC-560: Use of Known Domain Credentials Use of Known Domain Credentials CAPEC-565: Password Spraying Password Spraying CAPEC-600: Credential Stuffing Credential Stuffing CAPEC-652: Use of Known Kerberos Credentials Use of Known Kerberos Credentials CAPEC-653: Use of Known Operating System Credentials Use of Known Operating System Credentials CAPEC-16: Dictionary-based Password Attack Dictionary-based Password Attack CAPEC-49: Password Brute Forcing Password Brute Forcing CAPEC-55: Rainbow Table Password Cracking Rainbow Table Password Cracking CAPEC-70: Try Common or Default Usernames and Passwords Try Common or Default Usernames and Passwords CAPEC-112: Brute Force Brute Force CAPEC-509: Kerberoasting Kerberoasting CAPEC-555: Remote Services with Stolen Credentials Remote Services with Stolen Credentials CAPEC-561: Windows Admin Shares with Stolen Credentials Windows Admin Shares with Stolen Credentials CAPEC-565: Password Spraying Password Spraying
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.56 }} -0.34%

score

0.65511

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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Latest DB Update: Jun. 30, 2025 9:27